Method and apparatus to detect a plurality of security tags

Details Method and apparatus to detect a plurality of security tags Method and apparatus to detect a plurality of security tags

2006-05-09

2006-05-09

Wu, Daniel (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S010100, C340S010300, C340S572400

Reexamination Certificate

active

07042359

ABSTRACT:
A method and apparatus to detect a plurality of different security tags are described. A method to detect security tags may include establishing an interrogation zone using at least two signals operating at different frequencies; monitoring the interrogation zone to detect a plurality of security tags, with a first type of security tag responsive to at least a first signal at a first frequency and a second type of security tag responsive to at least a second signal at a second frequency; determining whether to generate an alarm if a security tag is detected by receiving a third signal including a combination of the first and second signals from a first security tag of the first type and filtering the third signal to remove frequency components of the first signal; and generating the alarm in accordance with said determination.

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